How do I create a Temp file that selfdeletes when it has completed its task?

[Steven Vollom]

I just had an idea of how to keep from clogging hard disk space with stuff 
that you only want in your computer on a temporary basis.

Is it possible, like for Torrents and downloading files to remain in a temp 
file only until they are completed downloading, then autodelete them from the 
computer after the completed downloaded files have been forwarded to a 
permanent location?  

I am trying to keep from duplicate entries in the computer and wasting space.

When a download completes, I normally click on remove torrent or torrent and 
data, if I don't like what I downloaded.  I expected that data to be removed 
from the computer, however, when looking in files titled as torrent, I find 
that there is a huge list of torrents saved there that I don't really want 
occuping HDD space.  It appears that when I instruct ktorrent to remove the 
torrents, it doesn't remove them at all.  They remain in a folder that I 
don't visit very often.

Steven